[Elecraft] AM with FM filter (was: Re: [Elecraft_K3] Re: Close to Ordering)

goldtr8 at charter.net goldtr8 at charter.net
Mon Nov 7 19:16:58 EST 2011


Why not go to the confurgation menue and change the filter setting from 
13 to 6 khz.   I bet it will work.

I dont have the filter so I can not check it out.

I am not sure what effect this would have on the TX width, maybe someone 
can check it out.


~73
Don
KD8NNU


On Mon, Nov 7, 2011 at 1:34 PM, Oliver Dröse wrote:

> Hi Joe,
>
> interestingly you CAN transmit AM with the FM filter! But it just 
> works for one over. ;-)) Found it out by chance during the last few 
> weeks with the nice 10 m conditions when tuning to the AM portion of 
> the band. I only have the FM filter fitted (besides CW/SSB filters) 
> and running firmware 4.42 beta (not tested with other ones) I can 
> transmit in AM. Just AFTER releasing the PTT I will get an TXFILERR on 
> the VFOB display and will not be able to transmit anymore. You need to 
> power-off and on the radio then to make it work again. As that is no 
> good QSO practice and you probably miss a few sentences from your QSO 
> partner during "K3 reboot" I just did one QSO that way (and 
> furthermore I am not really interested in AM just wanted to try it 
> out). ;-))
>
> Just my observations on that topic. Besides I completely agree with 
> you, I do not see why you should not be able (or better "allowed") to 
> transmit AM through the FM filter ...
>
> 73, Olli - DH8BQA
>
>
>
> ----- Original Message ----- From: "Joe Subich, W4TV" 
> <lists at subich.com>
> To: <Elecraft_K3 at yahoogroups.com>
> Sent: Monday, November 07, 2011 6:13 PM
> Subject: Re: [Elecraft_K3] Re: Close to Ordering
>
>
>>
>>> If you wish to transmit AM, you'll need a 6 kHz filter.
>>>
>>> If you wish  to transmit FM, you'll need a 13 kHz FM filter.
>>
>> This still bugs me ... *WHY* won't Wayne enable AM transmit
>> with the FM filter?  I've run multiple tests with a spectrum
>> analyzer and can find no image when I set the bandwidth of
>> the FM filter to 6 KHz to enable AM and generate a test signal
>> with the two-tone generator.
>>
>> I don't want to waste one of the limited filter slots for both
>> AM and FM filters but I want to be able to transmit either mode
>> if so inclined.
>>
>> 73,
>>
>>    ... Joe, W4TV
>>
>>
>
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